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From Wikipedia:

Étienne Geoffroy Saint-Hilaire

Étienne Geoffroy Saint-Hilaire was a French naturalist who established the principle of "unity of composition". He was a colleague of Jean-Baptiste Lamarck and expanded and defended Lamarck's evolutionary theories. Geoffroy's scientific views had a transcendental flavor and were similar to those of German morphologists like Lorenz Oken. He believed in the underlying unity of organismal design, and the possibility of the transmutation of species in time, amassing... Read More

Born15 April 1772
Étampes, France
Died19 June 1844 (aged 72)
Paris, France
FieldsNatural history
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